Improvement in registers



'ev cnoMPToN.

Registen Patentedmy 1e, 187.2.

PATENT OEEIGE.

GEORGE CROMPTON, OF WORCESTER MASSACHUSETTS.

{IMPRCVEMENT IN REGISTERS.

Specification forming part of ALetters Patent No. 129,006, dated July16, 1872.

To all whom it may concern:

Be it known that I, GEORGE OEoMPToN, of Worcester, in the county ofWorcester and State of Massachusetts, have invented an ImprovedVentilator; and I do hereby declare that the following, taken inconnection with the drawing which accompanies and forms part of thisspecication, is a description of my invention sufficient to enable thoseskilled in the art to practice it.

The invention relates particularly to that class of ventilators in whicha series of openand-shut slats are applied to an open or openwork framethat is set into the wall of aroom, said slats coming into one verticalplane, and llin g the back of the frame to close the ventilator, andbeing swung on pivotal centers,

. so that each stands in a horizontal plane with ppen spaces betweenthem to open the ventiator.

In my invention I connect with the slide that is pivoted to andsimultaneously actuates all the blades `mechanism by which, bysuccessive and exactly similar manipulations, the slide may be'olosedwhen open; or opened when closed, so that, without direct access to theventilator, and by pulling upon a suitablecord or wire in the samedirection, the desired result is obtained, the ventilator being eitheropened or closed, as may be desirable. It is in such a provision that myinvention consists, as well as in the specific means forreaching theresult, and in a provision by which the slats are locked in open or shutposition; so that their position cannot be changed by the action of thewind or by other manipulation than actuating the open-and-shut lever.

The drawing represents in sectional elevations at A and C, and in endview at B, a ventilator embodying my invention.

a denotes an ordinary box or register-frame, with its front open-workplate b. c d e denote the series of blades, each pivoted in the rearpart of the frame a, and each connected to a vertical slide, f, by astud-pin extending from an ear upon the slat into a pivot-hole in theslide. The slide is held in place by the ears at one side, and suitableguide-faces extending from the frame at its other side. At the frontofthe slideis an arm, g, in which is a horizontal slot, h, and into thisslot extends a crank pin, z', projecting from a wheel, k,

mounted on a shaft or pin journaled in and extending through the endwall l of the frame a, the wheel lo being on the inner side of the wall,and a gear-pinion, being fixed on the outer end of the pin outside ofthe wall. The teeth of a gear, m, mesh into the teeth of this pinion,and impart rotative movement to the cranlewheel. The gear m turns on apin, n, and has jointed to it a spring-pawl, o, that engages with aratchet-wheel, p, mounted and turning on said pin, said ratchet havingextended from it a lever-arm, q. The upper end of this arm extendsthrough or lies back of the top of a slot, r, in the front plate b, andhas connected to it a pendent cord or wire, s. To the arm the lower endof a spring, t, is attached, the upper end of said spring being fastenedto the'frame, the stress of the spring at all times holding the arm inits uppermost or normal position, except when the lever is being drawndown by pulling upon the cord.

By drawing down the cord to the extent of capability of downwardmovement of the arm q the pinion m and crank-wheel k are so rotated asto bring the crank-pin either to the atop of the wheel or to the bottomof the wheel, the pin, in passing up and reaching its uppermostposition, pressing up the slide and closing the valves, blades, orslats; and, in passing down and reaching its lowermost position,pressing down the slide and opening the slats. Whenever the arm is drawndown to the extent of its capability of movement the pawl-wheel isbrought to such positiony that one ofthe teeth of the ratchet will beleft in or nearly in conl tact with the pawl, when the arm is thrown upby its spring upon release of the cord, the slats being always left wideopen or wholly closed by a complete downward movement of the arm g.

To regulate the extent of opening from either a closed orwholly openposition the arm is drawn only partially down, any movement of the armshort of the complete movement leaving the blades or slats partiallyopen, and in such position that byvagain drawing down the arm the extentof opening may be increased or diminished.

Bringing the slats to a complete open or a complete closed positionleaves the crank-pin directly under or directly over the center of thecrank-wheehthe line yfrom the wheel-cen# ter to the pin beingperpendicular to the pinactnated slot7 by which dead-center 7 positionthe slats are locked in open or shut position, so that no action or theWind against them can open them at all if closed7 or at all close themif open.

My improved method of operating the ventilator enables it to be openedand closed Without direct or immediate access to the slats by theeasiest possible manipulation, and by precisely the same action to closethem that is used to open them.

I claim- 1. A ventilator, the slats of which are both opened and closedby drawing down an act-

